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Patented Apr. 14, 1885,

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ADJUSTABLE WATER LINE INDICATOR FOR STEAM BOILERS WITNESSES UNITED STATES PATENT EEicE.

AUGUSTUS W. PRATT, OF WATERFORD, NEW' YORK.

SPECIFICATION forming part of Letters Application filed December 10, 1884.

To all rah-0m it may concern.-

Be it known that I, AUGUSTUS W. PRATT, a citizen of the United States, residing at Wat-erford, in the county of Saratoga and State of New York, have invented certain new and useful Improvements in Adjustable lVater-Line Indicators for Steam-Boilers; and I do hereby declare the following to a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to a water-line indicater for steam-boilers; and it has for its object to provide a device of this character with means whereby upon the glass indicating-tube becoming broken said means, which are lo cated within the casing, may be lowered and adjusted upon the remainder of the tube, thus obviating the necessity and consequent expense of a new indicating-glass.

A further object of the invention is to provide means for the above-mentioned purpose which shall be cheap and simple in their construction and thoroughly effective in their operation.

With these ends in view the invention consists in the combination, with a suitable casing, of a vertically-adjustable tube adapted to fit upon the upper end of the same.

The invention further consists in the improved construction and combination of parts, hereinafter fully described, and pointed out in the claims.

In the drawings, Figure 1 is a vertical sec tion of my improved device. Fig. 2 is a vertical section, showing the tube lowered andfitting upon a broken section of the glass indieating-tube.

In the accompanying drawings, in which like letters of reference indicate corresponding parts in all the figures, A represents the casing, which is closed at its upper end, as shown. Upon the side of the casing, near the lower end thereof, is provided a branch pipe, B,which communicates with the boiler. (Not shown.) The said branch pipeB is provided on its upper side with an opening, it, having a downwardly-extending flange, the sides of which incline inwardly. Thelower side of the pipe B is provided with an opening, 72, somewhat smaller than the opening a, and in aver- Patent No. 315,659, dated April 14, 1885.

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tical line therewith. Thesaidlower opening, I), has extending upwardly therefrom an annular flange, 0, the sides of which incline outwardly. It will be seen that by this arrangement of the flanges surrounding the opening seats are formed, in which seats is located a cock, G,which in Fig. 1 is shown open, this establishing a communication between the boiler and easing.

Extending downwardly from the lower end of the casing A is an annular flange, D, which is exteriorly threaded.

Located within the casing A, and extending down through the flange D, is a metal tube, E.

Fitting upon the flange Dis a threaded nut, 0, having an opening for the passage of the tube E, a packing, (I, being interposed between the end of the flange and the interior face of the nut D, thus forming a tight joint and preventing the possibility ef a leak.

For holding the tubeE against turning while the nut D is being adjusted in position and tightened, I have provided a flange, 6, provided with a screw-threaded opening, f, in which works a set-screw, adapted to bear with its inner end against a block, 9', (see Fig. 2,) having a circular face which bears against the side of the tube E, and when tightened thereon prevents the same from turning.

F represents the glass indicating-tube, the upper end of which fits in the metal tube E. The said tube E is eXt-eriorly threaded at its lower end, and fitting said threaded end is a nut, G, between which and the lower end of vfrom turning, and the nuts D G tightened in position.

It will be apparent that by the use of my device the expense and delay incident to the breaking of the glass indicating-tube are obviated, and a device provided which is not only simple and. cheap in its construction, but one that is thoroughly effective in its operation, and is, furthermore, strong and durable.

I claim as my invention and desire to secure by Letters Patent- 1. In a water-line indicator for steam-boilers, the combination,witha suitable casing,of a vertically-adj ustable tubelocated th erein,an indicating-tube adapted to be connected therewith, and a set-screw adapted to bear against the said tube, substantially as set forth.

2. The combination, with a suitable casing having an opening at its lower end surrounded by an eXteriorly-threaded flange, of a nut on said flange, a packing between the nut and flange, a tube passing through an opening in the nut, an indicating-tube adapted to be connected with said tube,and aset-screw adapted to bear against said tube, substantially as set 20 forth.

. 3. The combination, with a suitable casing having an opening at its lower end surrounded by a downwardlyextending exteriorlythreaded flange, of a nut having an opening fitting said flange, a packing between the flange and nut,a metal tube passing through the opening in the nut, said tube being exteriorly threaded, a nut having an opening fitted on said tube, a packing, .a glass indicating-tube connected with the metal tube,and a set-screw passing through a threaded opening in the casing and adapted to bear against the metal tube, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

AUGUSTUS W. PRATT. 

